Limits and restrictions

IPv6-only internal networks are not supported
IPv4 must be used to communicate among all Forcepoint components, including other members of a Content Gateway cluster (multicast address)
With all user authentication, the domain controllers must be reachable on an IPv4 address
Range-based IP Spoofing is not available for IPv6.
SOCKS proxy is not supported
IPv6 support is not available for FTP passive mode with the transparent proxy.
IPv6 only clients do not display a block page correctly. The user is blocked from the site as expected but will receive a browser error rather than a block page. Dual-stack IPv6 clients receive the normal block page.